HUfTS TO COLLECTORS. 45 



(or rather, neglecting to pass aver) a single field may 

 lose him the very species it would joy him most to 

 nnd, 



I would also advise the beginner and, indeed, all 

 but the very experienced hands to catch, not necessa- 

 rily for slaughter, but for inspection, every attainable 

 individual whose species he cannot positively declare to 

 when on the wing, lest he pass by some rarities un- 

 awares. Thus the valued Queen of Spain, and the 

 much-disputed Dia Fritillaries, the Helitoeas, the Brown 

 Hair-streak, and (on the mountains) the rare Erebias, 

 perhaps some new to this country, any of these might 

 be mistaken by a novice for some of the commoner brown 

 species. Among the " Whites," too, the Black-veined 

 "White, that great prize, the Bath White, and the 

 white varieties of the Clouded Yellow and Clouded 

 Sulphur, might share the same fate, or fortune rathor, 

 of being reckoned as " Cabbage Whites." 



Then, with the " Blues." "Who is there that conic! 

 at once distinguish with certainty the very rare Maza- 

 rine Blue (P. Ads) from the common Blues when on 

 the wing ? Perhaps it would turn out to be less rare 

 than supposed, if all the Blues in a fresh locality were 

 netted as they came near, and set at liberty after passing 

 muster. 



"Why, only last season a very curious Blue, 1 neve* 

 before observed in this country, was captured neaj 



Polyommatus Boeticu*. 



